Stages of clay Flashcards
(19 cards)
Alumina
gives clay it’s plasticity
silica
allows clay to vitrify and become rock like
water
holds particles in suspension
iron
gives color, and acts as a flux
grog
reduces plasticity and gives strength
ball clay
increases plasticity
what is a clay body?
particular mixture of clay
how can you differ clay bodies?
color,texture,firing temp.,fragility,plasticity
how much does clay shrink?
10-15% from plastic to mature stage which occurs after firing
what are 7 stages of clay?
slip,slurry,plastic,leather hard, green ware, bisque, mature
Slip characteristics and uses
used to add color decoration and slip casting. characteristic: can be poured
slurry uses and characteristics
slurry is used as glue to stick two pieces of leather hard clay together. characteristics: cannot be poured, sticks to fingers
plastic uses and characteristics
used for wheel work or hand building. characteristics: does not stick to fingers, can be manipulated like dough
leather hard uses and characteristics
used for construction and relief. characteristics: cannot be manipulated like dough, can still have other clay attached to it
green ware uses and characteristics
ready to be fired not to be worked on. characteristics: no longer attach other clay to it, will dissolve and turn to slip
bisque uses and characteristics
used for applying glaze, planters and cooking pots. characteristics: will not dissolve in water, will let water pass through it
mature uses and characteristics
unglazed mature clay used for bricks tiles or sculptures. characteristics: will not let water pass through
why is it important to know clay stages?
so you know what processes you can do at each stage
what are 6 ingredients in clay?
Alumina,silica,water,iron,grog,ball clay
